Hello GeoNet,
i have a problem with API 4.4 and TileLayers. See the example:
JS Bin - Collaborative JavaScript Debugging
if you zoom very fast to the layer ( with SHIFT + extent selection) you have a very weird visualization:

In 4.3 the problem is not present... at least, you can see just a fast flash
In 4.5 it would be great if this sort of "halo" could be not present at all.
Thanks
Davide